Combination of screw spanner and nut breaker

Abstract

A combination of screw spanner and nut breaker includes a head piece having a nut receiving hole and a female threaded longitudinal hole, a tail piece having a first male threaded protrusion and a second male threaded protrusion, each of which is capable of threadingly engaging with the longitudinal hole, a first engaging piece having a first front end having an angled surface formed to match with an angle surface of a nutlike member, a second engaging piece having a second front end having a knife edge and a female threaded cover capable of threadingly engaging with either one of the protrusions to reserve therein the one protrusion. Such a combination bears the function of a screw spanner when the first engaging piece is put between the head and tail pieces and the other protrusion is screwed on the longitudinal hole and can bear the function of a screw nut breaker when the second engaging piece, instead of the first engaging piece, is put between the head and tail pieces.

What I claim is: 
     
       1. A combination screw spanner and nut breaker comprising: a head piece including a nut receiving hole and a female threaded longitudinal hole communicating with said nut receiving hole; a first engaging piece having a first front end and capable of sliding in said longitudinal hole; and a tail piece having a first male threaded protrusion capable of urging said first engaging piece to slide toward said nut receiving hole when said first male threaded protrusion is screwed into said female threaded longitudinal hole, whereby when said first engaging piece is put in said longitudinal hole and said first male threaded protrusion is screwed on said longitudinal hole said first front end and the wall defining said nut receiving hole can clamp a nutlike member and thus said head, said first engaging and said tail pieces act as a screw spanner; a second engaging piece having a second front end having a knife edge; whereby when said second engaging piece is put in said longitudinal hole and said first male threaded protrusion is screwed on said longitudinal hole said second front end and said wall can cooperate with each other to break said nutlike member and thus said head, said second engaging and said tail pieces act as a screw nut ruiner; and a second male threaded protrusion provided on said tail piece and coaxial and opposite with said first male threaded protrusion; and a female threaded cover capable of being screwed on said second male threaded protrusion to reserve one of said first and second engaging piece therein. 
     
     
       2. A combination screw spanner and nut breaker according to claim 1, wherein: said first front end of said first engaging piece has a first angled surface formed to match a first angle surface of said nutlike member; and said wall has a second angled surface formed to match a second angle surface of said nutlike member so that when said first engaging piece is put into said longitudinal hole, said first and second angle surfaces are capable of cooperating with each other to tightly clamp said nutlike member when said first male threaded protrusion is screwed on said female threaded longitudinal hole. 
     
     
       3. A combination screw spanner and nut breaker according to claim 1, wherein said first and second engaging pieces each have a longitudinal groove, and wherein a screw is screwed into said head piece and protrudes in said longitudinal hole for engaging with the longitudinal groove of one of said first and second engaging pieces so that said one of said first and second engaging pieces will slide in said longitudinal hole without rotation.